Why was ww11 so important?

World War II was fought basically to stop the growth of Dictatorship in the world

Hitler of Germany, Mussolini of Italy And their allies had terrorized the world with their ideologies basically of Nazism and Fascism which were radical and in this many people were killed especially the JEWS because Hitler was anti- Jew and so ended up gassing many Jews in a concentration camp and killed them all and so the Allied powers of USA, France and Britain and their allies came up with and idea to stop that radicalism

that was respond by facing Germany,Italy and Japan in the Second World war